Horn.



G. CARSON.

HORN.

APPLICATION IILED MAY 12,1913.

Patented Aug. 18, 1914,

CLARENCE CARSON, OF DETROIT, MICHIGAN.

HORN.

Specification of Letters Patent.

Patented An". 18, 1914.

Application filed May 12, 1913. Serial No. 766,935.-

To all whom it may (once/'71 Be it known that I, CLARENCE Cwnsox, a citizen of the United States, and a resident of Detroit. in the county of \Vayne and State of Michigan. have invented a new and improved Horn, of which the following is a specification.

This invention relates to means for producing sounds through the agency of an al ternating electric current, and its object is to provide an effective horn wl ich may be constructed at low cost and which shall have no spark This invention consists, in combination with a bell, a diaphragm and a case, of an eleCtrO-magnet having poles formed of substantially U shaped wires with all ends in the same plane andpositioned with their legs on both the outer and inner sides of a spool of insulated wire. of an armature adapted to be attra ted by said poles, and resilient means to force the armature against the diaphragm. I

In the accom 'ianying drawin Figure l is a central longitudinal section of this improved horn. Fig. '3 is a view showing the wires arranged to form the poles. Fig. 3 is a diagram of currents.

Similar reference characters refer to like parts throughout the several views.

The hell 1 of this horn may be of any desired construction. and the diaphragm 2 is mounted between the hell and the case 3 in the usual manner. cap 4 fits over the head of the case and has a central opening for the current wires 5 and (3 that connect to the binding osts 7 and 8, mounted in the head 9 of the case.

The ()letit-lft 'lIHlfllltl is of peculiar construction and consists of a body 1 l of gutta-percha, hard rubber, or any other of the many suitable non-conducting non-magnetic materials which can be baked hard at temperatures below that ,at which the fibrous insulation cf the wires of the spool 12 will be destroyed.

the

in Fig. 1. The spool 1; is placed between the' poles. the ends of the inner legs bent outwardly. and these parts are then placed in a proper mold. al'tcr which the insulating material ll is poured around the wires, and then lHth'Oll. The extension 19 may be termed on the body ll it desired or it can he madeseparately of any desired material and then united with the body 11. The h ad 5 is preferably formed with an annular flange 20. which. together with the extension 19. may be threaded to tit each other-ps that the electro-inagnet may be adjusted with reference to the diaphragm '2, a jam nut '31 being employed to lock the parts in position.

The body 11 and extension 19 are drilledand the latter threaded to receive the adjusting screw 23 which tensions the spring 24 that bears on the ball 25. and presses it toward the diaphragm. The ball bears against the end of the stem .26 on which is a disk '27 of soft iron. while on the disk is a projection 28 which normally contacts with the diaphragm 2.

l nder normal non-active conditions, the spring 24 holds the projet'tion against the diaphragm 2 parts. When an alternating current passes over the wires and (i, especially a current from a magneto. the poles and to will become alternately magnetized and demagnetized.,the polarity of the poles reversing at cach-new magnetization. Thus when the current is negative. or below the line A in Fig. 25. the outer pole.or wires [5 may be come magnetically positive and the inner pole or wires 16 magnetically negative. When the current changing, or crossing the line A. the poles become demagnetized, and when the current becomes positive, or above the line A, the polarity of the poles will be the reverse of what it was before the change in the current.

At each magnetization of the poles, the armature 27 will be attracted by the electromagnet. and at each demagnetization prior to a change of polarity. the armature will be rclca ed by the poles and forced against the diaphragn'i 2 by the spring 24. As soon as the clcctro-imignct is again energized, the armature is again drawn away from the diaphragm. The result of such striking of the diaphragm by the projection 28 is a and prevents any rattling ofv sound which may be a musical note if the alternations of the current are sufiiciently rapid.

I claim. I

1. In a horn, the combination of a bell, a case having a base flange, adiaphragm between the bell and the flange of the case, a cylindrical body of non-conducting and nonmagnetic material mounted in said case, a spool of wires embedded therein, a series of substantially U-shaped magnetic wires Within said body having their legs Within and without the spool to form two circular poles in the face of the body adjacent the diaphragm, a stem slidable in said body at right angles to the diaphragm, an armature on the stem between the body and diaphragm, a spring within the body to force the stem against the diaphragm and Wires to conduct current to said spool.

2. In a horn, the combination of a case, a bell and a diaphragm between them, a cylin drical electro-magnetmounted in the case with its axis at right angles to the diaphragm and having two circular poles at the end adjacent the diaphragm, an armature for the magnet anda guide therefor, means for forcing the armature into contact with the diaphragm, and electric wires conneeting directly with a source of alternating current and with the winding of said electro-magnet.

In a horn, the combination of a diaphragm, an electro-magnet having an annular spool, and poles in one end adjacent to and parallel to said diaphragm, an armature for the magnet between. the poles and diaphragm, a guide for the armature, means to force the armature against the dia phragm, and uninterrupted means to conduct an alternating current'to the spool of the magnet.

4. In a horn, the combination of a case, a diaphragm, an electro-magnet having its two poles in one end adjacent the diaphragm and a spool between said poles, an armature for the magnet between the poles and diaphragm, a spring to force the armature against the diaphragm, said case, diaphragm, magnet poles, spool, armature and spring all being concentric with'each other, and a pair of wires extending through an opening in said case and connecting to said.

spool.

In a horn, the combination of a bell, a case to support the bell, a diaphragm between the bell and case, a cylindrical body of non-conducting and non-magnetic ma,- terial mounted in said case, a spool of wires embedded therein, a series of substantially U shaped magnetic members embedded in said body with their legs within and without the spool to form two circular poles in the face of the body adjacent the diaphragm, a stem slidablc in the body, an armature on the stem between the body and diaphragm, and a spring to force the stem against the (ii a phi-a gin t In a horn, the combination of a bell, a case to support the bell, a diaphragm between the bell and case, a cylindrical body of nonconducting and nonanagnetic material mounted in said case, a spool of wires embedded therein, a series of substantially U shaped magnetic members embedded in said body with their legs within and Without the spool to form two circular poles in the face of the body adjacent the diaphragm, a stem and armature adapted to be moved avay from the diaphragm by the magnetic poles, and means to force the stem against the diaphragm.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

CLARENCE CARSON.

Witnesses:

HUGO W. Krnmnamo, MAR! A. HAWTHORNE. 

